Here is what I did in less than hour. This is invertor coolant reservoir.there is label also to confirm that. I did this in my friend garage .raise the car and locate drain plug for invertor coolant.
First open hood and locate reservoir with invertor coolant. Make sure that you don't by mistake mix invertor and engine coolant location.
Check the level that is correct before you start replacing coolant. This is pic of invertor. Here is picture of engine coolant reservoir.make sure that you see this and understand.two mini tanks for coolant and they are same colours but different drain plugs .don't mix this. Under car locate drain plug for invertor coolant only. I did paint with red paint drain plug for transmission fluid. That plug don't touch . This is drain plug for inverter coolant.now you need soccet num.10 mm.to drain fluid out.make sure that lid on resorvir is unscrew in order to drain coolant much faster.
10 mm socet must be used in combination with braker bar too.mine was super tight over 30 ft/lb I think. Braker bar used here to get more torque. I was catching fluid in plastic container to recycle and also measure how much coolant is in there. Drain plug and washer.i did some clean up and some measurements for later if can find better drain plug. Gasket I did found but it was outside diameter wrong. circlel New gasket on left side was bigger than oem on right side. I had no choice than use old one until I get something better. Here is some specs for drain plug and gasket. This is gasket specs.
after coolant is drained completely now was time to add new coolant.
I did measure how much fluid /coolant was drained and it was 2 liters on a dot. Here you can see. I did put tape for easy level check adding new coolant.
Make sure that invertor tank is empty before you start to add new coolant. After old coolant was recycled ,I put 2 lit of new coolant and start adding to mini invertor tank. Slowly add fluid ,wait couple min and level will go down. Again top up fluid to Max and get ready for next step bleading air from inverter pump.
Level is ok for now and we are ready for bleading. I got this software from internet and help you to energize pump without running the engine. Connect via OBD2 port and USB connection to computer. Get on line with ECU. When you are on line with car this is msg you got .with all readings Just to mention one important thing you will just push start button twice without pushing brake pedal ,do not start engine. Make sure that usb is very tight connection and secured. And now just follow procedure for air bleading. When you established connection with ecu in the car than select hybrid system as per picture.above. Select active test and move to next step. Now activate invertor pump from this menu. Run pump just 5-10 sec.and monitor coolant level in mini invertor tank. Just toggle pump ON and OFF several times until bubbles stop coming out. Pump energized,watch for bubbles.,and level of pink coolant. Add coolant if necessary. Top up coolant again and stop the pump if no more bubbles coming out. Pump is off now.
Make sure level of coolant is at max. Put cup on mini tank secure it and clean area if you still any extra coolant around. Now turn off car and disconnect OBD2 ,mini VCi Start the car and check again if it is any more bubble left. If fluid moving slowli than you did great job m My next invertor coolant will be after 50 0000 miles.
correction 50 000 miles.
I hope this will help to navigate you thru this process.
Please remember you are doing this at your own risk.
This is just for educational purposes only.
I am doing every 100 000 km invertor coolant change,but you can do longer as per owner manual.
Yes I did paint invertor orange ,to stand out.lol.
This is very simple task and it is good ,extend life of you inverter.
Other comment was that paying mechanic to do that,I agree if u. Are not confident enough just ppay mechanic
1. The plug is in a pocket with tight gap all around. After 9 years in rust belt the gap gets filled with rust and the plug gets completely fused to the pocket.
2. Why use such a tiny inner hex socket (compared to the size of the nut)???? The socket on my car is now completely stripped. There are aftermarket plugs that replace it with a much larger outer hex head.
3. The plug material seems very soft - did not take much to strip it.
The only consolation is that the drain plug screws into a replaceable plate (part# G102048030, ~$70, held with five M6 screws). My plan is now to replace this whole plate. More pictures are coming once I get the plate.
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